Remove devices only in the main thread

BTIF HID host runs in JNI thread and calls `BTA_DmRemoveDevice()` for removing the HID devices. This function removes the device entry from `btm_sec_cb.sec_dev_rec` which must be touched only from the main thread.

Change-Id: I05690191a02ee6f9ebf09c73d90c4ca4365bd171
Test: atest BumbleBluetoothTests:HidHostTest
Flag: com.android.bluetooth.flags.remove_device_in_main_thread
Bug: 380992931
Bug: 381275933